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-6-
h5
=
1
h5=0
All digits off ( DIS=
L)
VAL
VBH
On
VBL
VAH
Off
VAL
VBH
ON ON ON
ONOFFOFFOF!FdFFOFFOFFON.
ON ON ON ON ON ON ON
OFF
All digits off
VDJ
S=VBL
--
Segment waveform
VBH -- ------~
Back plate
(H1)
waveform
VMH
--
-------------------------
Segment output waveform
Hl H2 H3 H4 H5 H6 H7 HS H9 H10Hl1H12H13Hl4
H1 H2 H3 H4 H5
GND=VAH-
hl
(TRl)
h2
(TR2)
h3(TR3)
h4(TR4)
h5(TR5)
HA
DIS
RES
•
Counter
unit and segment waveforms
-
PC-2500
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